She then dubbed Trump, the Republican presidential
frontrunner, "ISIS' best recruiter."

Pundits debated the claim all weekend, and
several
fact-checkers
ruled
that there's no evidence to back up Clinton's claim about the
terrorist group. And one ISIS propaganda expert told Business
Insider that the group actually talks about President Barack
Obama more than Trump.

J.M. Berger, a Brookings Institution fellow and coauthor of the
recent book, "ISIS:
The State of Terror," told Business Insider that he isn't
aware of any ISIS videos featuring Trump.

"They talk about [Trump] on social media, but not necessarily in
a calculated, organized way," Berger said in an email.

"They talk about Obama more, since he's the one actually acting
against [ISIS]. Trump has been a bit of a sideshow until now.
That could change now that they see some headline potential
following the debates."

One recent ISIS propaganda video featured several US politicians
— former President Bill Clinton, Hillary Clinton's husband, among
them — but made no mention of Trump.

When asked what Clinton was referring to with her claim Saturday
night, spokesman Jesse Ferguson initially pointed to
comments from Rita Katz, an expert on ISIS propaganda and
co-founder of the SITE Intelligence group. Katz
told NBC News recently that ISIS follows "everything Donald
Trump says" and references his proposed Muslim ban as proof that
America hates Muslims.

But it appears that the claim about videos specifically can't be
verified.

Clinton communications director Jennifer Palmieri
went on ABC's "This Week" to respond to the skepticism
over Clinton's statement. She said Clinton was "not referring to
a specific video" but noted that Trump "is being used in social
media by ISIS as propaganda."

Katz also couldn't confirm that ISIS is using any specific videos
of Trump. When asked about the Clinton campaign using her quotes
to back up the video statement, Katz pointed to her
tweet from Sunday that said, "ISIS didn't feature Trump in a
video, but ISIS supporters/recruiters have used Trump's rhetoric
to promote ISIS' ideas and agenda."

"And as you could see, the NBC
original article didn’t mention anything about a video," she
added in an email to Business Insider.

After Trump's statement proposing the ban, jihadists on Twitter
reportedly expressed a "lack of surprise" and characterized the
proposal as "Western oppression against Muslims," according to
the SITE report.

The report cites tweets from ISIS supporters, a supposed ISIS
fighter, and a fighter for the al-Qaeda affiliate Jabhat
al-Nusra.

One tweet from an ISIS supporter said: "Why are people shocked
with Trump he only said what most kufar [disbelievers] are afraid
of saying."

Another ISIS supporter tweeted, "The actions of Trump are just a
trailer of what is awaiting Muslims in future in" Western
countries. And yet another ISIS sympathizer said, "I
wonder if President Trump will allow Muslims to leave the US for
Dawlah [ISIS territory]. He hates Muslims so much, allow those
that want to leave and live with other committed brothers and
sisters without kuffar oppression."

"This is the sort of thing we are seeing," the SITE
representative said.

"Hillary Clinton suggesting that Donald Trump is being used in an
ISIS recruiting video, man, talk about chutzpah," Bush, who is
also seeking the Republican nomination for president, said on
Bill Bennett's radio show. "There’s no evidence of that. There’s
no evidence of that at all."

Though it's unclear whether ISIS — which is also known as
the Islamic State, ISIL, and Daesh — has featured Trump in
videos, the group does push the message of a clash of
civilizations between Islam and the West. Some experts
have argued that Trump's rhetoric can be used as validation.

Clinton's campaign did not immediately respond to an
additional request for comment on Monday.